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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95360850cf343e17b2a2997cad3a63415ba41d64c14001224f7d37c202d57682' 
  AND token = 'nsYz2Q0y/0rvn+MlSsV47ZCJqy1hwWawNKsyLG77s7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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