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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f16928a3ce3107f71f7b8a9b615d1c2ec2a0ec80e0cde790effeb98d589f082d' 
  AND token = '6PuM0H9lmG4eac30gAkWulqjcxwRhf5z7tPGVydZdCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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