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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7b8cd5270d1b1d44a670b3abc943c8029400e32d622242eb528f9eee5a3b28' 
  AND token = 'zaMZvHvFNBcS3y7LmhbnAM0SjGCmD2M3bGp/qBfC+kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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