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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec57b6d0574a9c4d647f4f3798a106f40809cd5fde4a69bb82fcced5cbf3655' 
  AND token = 'rq1HS22kXo6Ry+TGkDwepr48j7V24Q7HBF6nXiTrazY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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