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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f224de9752a634153468ef0d8bc7de4429d40b68018bcaf2883a8b89c31485d' 
  AND token = 'wy1NAfu9J0lwILc8F+z7eKDr+IeBf0hZFf3N5ygRu9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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