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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa86fd253087718498f59c9a96313fce96c89fb576f010ade9ea44f5acc22796' 
  AND token = 'egG+eURckEAS85yeLi+FoeP/3djI1Z5OpBtMVqFbf+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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