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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '558837f7ddbcb3d04844c41740cf02f693e6bddf3ccca08e3d6b41d0640cf471' 
  AND token = 'SSZwEU+H9KP6leC0UtLG2FO2kZPiPajgSMOzMmYCfjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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