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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9246a4e6e4fd6b9f6bb5ebc58edfafea633ac22d883e3a361447bf0ea44a3a3' 
  AND token = 'oQBetZXmFu3JFuBLa4WzY1j9hXV2FaMgYd56ODPGAgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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