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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '412027d09fd79db26ce599a1dd12b06023b3b3c0b9fd41989d0a5a3d18d003c7' 
  AND token = 'FBrYKk/F9l/cYHzWALb+T//FdOjzyL3Y6Gq7QJGeYw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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