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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f45ea254864c0a857b0ebd5afd43a80f579f10eef8cf5e0c0cdd2f3c6f197d9' 
  AND token = 'vagu6hmw6Uvr51x2gLimlDAmdJHxPMofL0C6zEF/cMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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