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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a931efcb99c00ce06ec8b682f61ead84df3e67967f7f7f8b31e0f880139838' 
  AND token = 'TU8M+CKRbXtuRsRS5YxYHhFSupKIX3JejJ3huyBky1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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