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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7dc29c5c3b08bb46c36595198f7967abf131718fd728f32e8051dc7bd32095' 
  AND token = 'nxqpPrwcFEkd9JtilWSy0tHJFtiB5WegGbFpxFdOmNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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