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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c5e22b06481cad1f79d4859ba66cbcdf5d65aab0fc577a7711e44cebe902f7d' 
  AND token = 'BG+bnodlXqw0/0igi4vR1Z9m/aUYlcPNBcW8/c0u2HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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