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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90362a6183ab80f072377fd0c6a3f88eed41662291044b2e303add639008a449' 
  AND token = 'GGJb/oUweSNiApwBK4NYj8u8yCvQjhO0Ba7we9od1v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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