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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36fd92f8eb80f9ea846e6cf6bca21dd0a5546da136229f158a4d7ca68c93c105' 
  AND token = 'HYwqoDjkBsQrkg8dRNeAdt36WwyDEiTb/oReG/lw2Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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