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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc5c5acef1174a5853ab0ca4c03e9da2b782f5df4b2f54645f398ca8645a5dd' 
  AND token = 'MblSXJsnBB7E7aQQ0+uuSkCLShrA8CiufX9fbMlZj/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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