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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1e11715cdf574ab7271c685dc03babf2d893b57164b182af1f3c9d72faafd56' 
  AND token = 'rzfRVGVAgP483SrQSfOHPmO8nfoa1ceg0LXrOa+pCp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00129

JSON explain

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