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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f6360e577f53ac3932c88cd557ee9f50a64114839d65ad48e6d8935d7a2e273' 
  AND token = 'LNFf84v5pGK/6bkt00R5lYjK0fj0z5Wzv0LRMgzRclE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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