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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f51265a017d0a6887c7c0e2f3440877873d85184612bb5768aeb05a652dd8fe' 
  AND token = 'YmJ2HbsaFCganIPQMgvdOVssjNa8I48Elx5+pkB8kYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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