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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab3554e03dd9ea12589739cb3ad81130f9bd6fe46551181dee3228fc3b774689' 
  AND token = 'RYOZUSRKVKsdlY/TnpZ6Aq3KIRs7V27i21EFrmBlFa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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