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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9896e2563a5ddb2ff1553d8539aad08ff313aa0d69afcf197a6a9f2aca34bb6' 
  AND token = 'lbH+IS8sa3HKEp2kKZiTLmty5O3oIawQBnoseRDPlSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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