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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99efb5085af67e4e269a7ba351fa19fec09ddd2dcdbb224e4dce0b97a3a6f728' 
  AND token = 'z6LUYjumhlhngufc2sGridC3JmFmFhu7UQ6iWR2hrf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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