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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b2d080483cbdd8ac0fa6ec26172965ab8b2a4f72680c9664cc84367aafb22a' 
  AND token = 'e84OU5HTMqZ4zLArsImnhOb09HS/QyB4DshULaujI74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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