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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30422990571cd37e97ae9d837d440514253a0b1eddab406ba67c60dd4fa24f6' 
  AND token = 'Hn1Cbnmo1fvM34JFIijIReYm2eZSd2dcldjFBa9H564=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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