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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2abed1c7e3cd6270d1150a61d287633e9582e62129cc4df3d91f209a4c92d233' 
  AND token = 'utmHcZYmfdKMVkBcy9heQoJ+l1aRXt+8XSU47rdvcDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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