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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4655e7620921e5ef27e5ca161586d6c8a982c3a9fa229991f4601a7c73b988fd' 
  AND token = 'GWNJZip6aS7/V/szmWMf9Q+880jxdD3o8dmn72c6NB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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