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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991a746c5f6d3d27e68c80e53175ce64710f3f132b5842ec4b272fee3f7ffee9' 
  AND token = 'tr8aZ170AqO5byzt6e7lsvZVo8X3lcP64eXrUriAXCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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