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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca412e8f28e13941bdf3447a78156e5bf4d0bc08c3cb126eb8a7ac69b5e5e63' 
  AND token = '1apyp8T5heHwq8sdGwupfOibYnTA7tNy4tKVJzqdU0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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