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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a775304fd817fa150f31dfbea3114d093b59a752089f7e5041e19e1c9a5891' 
  AND token = 'HoIhH5LGoNoSkfkG7dyRIaN9lsdugTL1GEX7Gd29sx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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