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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d134643c1262252a78f5a969777d5a3ff214cd8939ad84ce57b7d4a159b8777' 
  AND token = '++yDbjQCIjTci9n2hcHxj2RxqX1WbCKwJjf72O9cLM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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