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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e97c9b09133edd151da2425982104fbe3fa20954af8d2a23c4a89733d71db89' 
  AND token = 'Z6f1QuaVMLcanMcwQ8V30bfTHVehe90sYRm4ugas9vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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