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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac897c7f8a706c459628138babe137ea77139c37d2aca719f38d06905b4dc977' 
  AND token = 'KHtNxqk2uY6DztnccJsNEAa5WGScoDBCBLTTr41yB0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}