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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0de87e03626e70c0165bd61a6e67606f332ad5284fde0de488a7d39995136c4' 
  AND token = 't4kfAUNBL340DJdlryjefTCAT+K0PMox6DPK7Nv6pFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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