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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c26c2e7537742e7e94de45d24801a90bc4e3e216c62de495e4a8e8260468db9c' 
  AND token = 'GWj3Tw4UAu6BHiqerPFG3NeVoTWR8HsxxTckrbDMpwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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