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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a20b5dcec3833f842fa4ed7da2b8653dd0ec141bba9f016a9d12c7f47e496c' 
  AND token = 'm8TEK+ZrGS6KZRXzfm+jIfFGaS8sUjstn6aLZa367fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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