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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d79947318bab762c774886ea71748277ab98eb01c427264c46e39a5af8d7cb8' 
  AND token = 'um4n/O9tcvaNOq0nWTnls7C2B+UhoIFicTeDE7qa9Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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