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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72915e60135415e2089458887e7a2714e5e0fdbc435cfc3e6e48e494aef6b239' 
  AND token = '+6pSgeOCi6uqOKdZdcyTvhRZabCvI8/2yX6rZkin0PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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