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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d8a0816f2f36bf6a10addded74a3a299b3602bd43a7e81a85dd786109fe051a' 
  AND token = 'b14XZEqU5HeuC8z+eBsxG5wvZo6xbRPyDdeithgWIkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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