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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f497415f3766d444bbed0b303934314cd343b59f402b37fd0efbf5b6e208dc5' 
  AND token = 'Y2CiJIn0gNca1NCAZ+1GUy4svR+PwPO4kyI33QKn/k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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