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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9ef9d19c7ef9144e91b7bc957fe1e95cb4de6c7a62d3e4140e164d05f31605' 
  AND token = 'O1pENLb8JKOsTAAUXxqGar17Rtx0l+YR0wsCmfYWoxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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