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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6abf0020557c1df74f4d8aed506379b7e0e9d6d3d49313b7b7f3d1b5efbe4d' 
  AND token = 'laL/cr5L4w9hVcBAH/aeqDzkp0ByIwW9W9rZh0Rxniw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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