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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5985f826cb606af37a96a738f4346927c136d82fad5e368fe8d733ef6e2607' 
  AND token = 'W3KyJ5lImYT0zeCYJVO3vYc01HnS+zjrE+xHkKTI2QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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