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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34beb520a14cf09f3cc9046418c2a80a90f051c1d711379ea718b256820ff2f' 
  AND token = 'wkyNY83VMq9bOC6pURLum6WcOGH5xBCe5YLrkXPwRHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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