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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce23f371032c3d56f0af6f7faf1010923dab36442f01d2a933975b4e8cab47d1' 
  AND token = 'uvOmpGB+RKABJBbSEvdsLVBQd7RHNgoQNNEH9ZY0k6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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