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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e0eb9b140b6a266fce5477978cf8c5d4ea52712f510060c4612c057c2a7b49' 
  AND token = '+I+P3WFW95Qm+QxuDNIoxy8aT3bRDzKo+HEqwke69ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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