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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f9b709a2960ee6083615a41c77b6392bf4f420cfc6e0232eeb0531aed0be1cc' 
  AND token = 'yXMTmiJjGPZolriy7p8Lq2iT4Uc+WBItkjADZlJkf5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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