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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc73e4eb0422cdac8c285eb0658f59cbea5994c9bb2e401fab9052d911b7b68' 
  AND token = 'wnpD8Bef3PTsRV1pkRGtAabQZlVP4FibFk9fB3Gr/+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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