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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27e4fa2f0aef709311d007ac8beed02048612e2e69a2391292fcfb70c0c484c4' 
  AND token = 'pTGg7fwv3cKuvuop2J6s6ri4akfRY+8esgyHdLwLQPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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