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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b2d70cf268c5a6c447e8e5e83235889b6cc4f769d877819fffbd9665944ce4' 
  AND token = 'dIeXUpcL6bxL36vdulfl0d/+ArhBhvQmHKfFRO4WD7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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