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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a42f9e4f2602404a3526359494af5da950bb7dd6d7f36c713bb711ee86d46e0' 
  AND token = 'IOAhmHz5i99pHrOgpIQN3rb+T8pqk3NXy9fmZsrJj5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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