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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6d0e40b2d6dae845ad8a3f36d9fe9ee90b0f0a6bb1263db9aa091d0b74d6164' 
  AND token = 'l7RsPQgZs48wbQX3pPDiiNnAKSyQUJSXwBD6F3rbHwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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