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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b596a06e028fdd3400659738d79ddd2fd50e13cd862f15c5bb907d7934f7948' 
  AND token = 'Zaj3kc7NrQUw/1tqAvE9s75kXdcBH4rITYXQE7n6sxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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