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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1972965f495d3bafe26e31b5b28d035717032f1774c7058d26651c17d63abe5a' 
  AND token = '/kzw4Nji7gaBTjD0Se7RMqyLh4ptjXiVXLXSKCfoMfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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