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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b633ede549d6685e253df59fba8ca62968e7c6acaf375cccd3d57697b85db5c2' 
  AND token = 'eDtroMkOaPVtoanv2jabIS+hUn90zQSpG2WygY7FyfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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