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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c288f10c7cfb9b8ec20841928b38e004688c1708a44aa2cfae3f75d7a213eef' 
  AND token = 'ZA9DdYBKbXUMAjrKluHcNJj/ZAITf9rBdHpoqZHyY0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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