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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a0f6405af4491f6f3c8054691bb93ccc179f9e1fea84538c68e2729b21e61b' 
  AND token = 'H9muQLIXjTG3uo5Bazr7VFRRbz8+hSo4GBFha7bENU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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