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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7a3a9e68ca6006990cc7494eadca618e3a3bdffed722b6bc4d2aca27663272' 
  AND token = 'BMgo2om7L4fAFV0d5m1pjjlRsb1skN0w63JhGCzepVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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