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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c6cbff6d5670ffae467ced2e83e19320d253087354db69d2f5a035d525ff082' 
  AND token = 'XG8RAj/lUJv00arRtb2jU6oI54dBAYsGM7T8qKjnGb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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