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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9796af7eaefbf66aa4fb2e92bba318b58464e45ca7b32b474f3051bac01a304f' 
  AND token = 'YtpzRGKeFpqi4s9p1CcOHaM0bBJXiNUSo9kRnXLW5gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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