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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dcf7b66c2cfdca404d8e8038ee1756966c8d417f3adb89057eb750b3b7025da' 
  AND token = 'B0ytsTcbqU6rGrLYWh8ThdY4ql9Sud/gtCJylqJ5akI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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