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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98df7449a9ce6412c24d5bb8361a39606ee85d74f3d29d9f8184f7a8ff967d18' 
  AND token = 'xckN+PAI2nqMSQp6wra/oAyq5FC8YAvYITrh1/y8D0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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