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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58402fa564f962bda58b023f4cf3a2cfc5d390af681bc2058e89bd366c959b84' 
  AND token = 'b8CdNXw4a3YdhDhJLaa3qTIkElt8qtgmvsC6Fpxa+pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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