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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c7d35850853d8bbda23ed412b3e932471031d277f28ee1f154dd52a1a07071' 
  AND token = '2H33/Ne6uOdcBiKy4zXo/rbWrdA20UYANq5LhOmSK+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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