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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f6714893c36ae1ba31316c618252c373927bdf44fe0cd8a3c60a0b2b0d1aa4' 
  AND token = 'WSqkjiDisIOGTm/ipRIO47D+UxrVNyyACjvw9hg2ytE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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