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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed1adfa54bb343f70ea7505daeb037b98e78247b08e61d8d625365135140eea4' 
  AND token = 'o0TMthUDS7kK+FML0WRAATv6BkcGSFLbXrza+AgK2CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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